Thermal effects on the strain rate-dependent behavior of highly compacted GMZ01 bentonite  

作　　者：Pengju Qin Weimin Ye Qiong Wang Yonggui Chen 

机构地区：[1]College of Civil Engineering,Taiyuan University of Technology,Taiyuan,030024,China [2]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai,200092,China [3]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai,200092,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第1期453-464,共12页岩石力学与岩土工程学报(英文)

基　　金：the support of the National Natural Science Foundation of China(Grant Nos.42030714,42177138 and 41907239).

摘　　要：Investigation of thermal effects on the strain rate-dependent properties of compacted bentonite is crucial for the long-term safety assessment of deep geological repository for disposal of high-level radioactive waste.In the present work,cylindrical GMZ01 bentonite specimens were compacted with suction-controlled by the vapor equilibrium technique.Then,a series of temperature-and suction-controlled stepwise constant rate of strain(CRS)tests was performed and the rate-dependent compressibility behavior of the highly compacted GMZ01 bentonite was investigated.The plastic compressibility parameterλ,the elastic compressibility parameterκ,the yield stress p0,as well as the viscous parameterαwere determined.Results indicate thatλ,κandαdecrease and p0 increases as suction increases.Upon heating,parametersλ,αand p0 decrease.It is also found that p0 increases linearly with increasing CRS in a double-logarithm coordinate.Based on the experimental results,a viscosity parameterα(s,T)was fitted to capture the effects of suction s and temperature T on the relationship between yield stress and strain rate.Then,an elastic-thermo-viscoplastic model for unsaturated soils was developed to describe the thermal effects on the rate-dependent behavior of highly compacted GMZ01 bentonite.Validation showed that the calculated results agreed well to the measured ones.

关 键 词：Highly compacted bentonite Rate-dependent behavior Constant rate of strain Temperature Elastic-thermo-viscoplastic model 

分 类 号：TU44[建筑科学—岩土工程] TL942[建筑科学—土工工程]